He will probably be here tomorrow.
What bothers me is that they used an ultimate ability on Vesper, which kills an unlimited number of people. At the same time, there wasn't much excitement, and it was unlikely that everyone would rush to her. As a possible explanation, perhaps the mafia players wanted to "shut down" Vesper, without the possibility of resurrection. And they didn't go for a regular attack because of defense/healing/a bunch of other stuff. Of course, most likely they just played mind games, making everyone think they would all go there, but another option shouldn't be overlooked.
It can also be argued that among those who voted for Master, there is at least one mafia player, so as not to be a cop. Also, those who accuse completely random people are alarming. Wasn't Vishmaster there?
Here are the voters for Master, if you need them. I predict that there is a mafia player among them. If not more.
If we look at the list of those who voted for Master:
MedjersoN_HP - I am not mafia
Ment - not mafia
VesperLindt - not mafia
Neira Drake - I have a very good impression. At first, I doubted, including myself. All day she voted for Ment, then responsibly came exactly one hour before the end of the voting and switched her vote to Master. Will anyone believe that she is not a town member?
Ehsa Aileri - an unfounded vote for his own person at the beginning of the day? (although this is in Revan's style) and he didn't back down afterwards? well... maybe. But it's unlikely he's mafia. In any case, he's not in the first line of suspects for hanging, or even the second.
Nefela - my impression is good, but nothing definite.
I agree, Vish looks like a mafia player who was brought in at the end of the day to cast a vote. But still, I would execute Sezam. Seriously, here I have no doubts.
While people are guessing about clues, let you and I, Ment, make a list of all candidates for the mafia. I mean, I agree with you that Sezam is more likely to be mafia, but that's not enough. We need to identify everyone.
My version: Sezam + Snowman + Vishmaster/Shaman.
Alex with numbers, IMHO, is not a serial killer. It would be very underhanded and unsportsmanlike for him to go every night and not write a single message during the day.
p.s. Damn, I can't calm down. Where else should we look for mafia players besides among those who voted for their own person? You can find a third or fourth mafia player there, but definitely not the first candidate for hanging.

В тихой однообразной жизни всегда так бывает: каждый отдельный день бесконечно долог, но месяцы и годы мчатся с непостижимой быстротой.
I wanted to offer you some flowers, but a crown would suit a princess like you much better
Смысл жизни в том, что жизнь на тебе не заканчивается